I'm just wondering could changing the position of the pulse Plethysmograph from the finger to the ear modify the temporal relationship between the blood volume signal, the ECG and heart sounds?
why might this be?

(Original post by amielle)
I'm just wondering could changing the position of the pulse Plethysmograph from the finger to the ear modify the temporal relationship between the blood volume signal, the ECG and heart sounds?
why might this be?

Not entirely sure what you're asking, but the above seems to sum it up quite well.

Obviously the pulse wave does take time to move from the aorta and along the blood vessels but its very fast and does not result in a clinically significant reading, with the exception of pulse wave velocity measurements as a marker of cardiovascular risk (faster = stiffer arteries = higher risk) but that is limited to research contexts at the moment as far as I'm aware.